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                    实验简介
            
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                    更新日志
            
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        <li class="header">实验之前</li>
        
        
    
        <li class="chapter " data-level="2.1" data-path="../../pre-lab/env.html">
            
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                    环境部署
            
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                    GDB 调试方法*
            
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        <li class="header">实验指导</li>
        
        
    
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                    实验指导零
            
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        <li class="chapter " data-level="3.1.1" data-path="../../lab-0/guide/intro.html">
            
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                    摘要
            
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        <li class="chapter " data-level="3.1.2" data-path="../../lab-0/guide/part-1.html">
            
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                    创建项目
            
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                    移除标准库依赖
            
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                    移除运行时环境依赖
            
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                    编译为裸机目标
            
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                    生成内核镜像
            
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                    调整内存布局
            
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        <li class="chapter " data-level="3.1.8" data-path="../../lab-0/guide/part-7.html">
            
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                    重写程序入口点
            
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        <li class="chapter " data-level="3.1.9" data-path="../../lab-0/guide/part-8.html">
            
                <a href="../../lab-0/guide/part-8.html">
            
                    
                    使用 QEMU 运行
            
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        <li class="chapter " data-level="3.1.10" data-path="../../lab-0/guide/part-9.html">
            
                <a href="../../lab-0/guide/part-9.html">
            
                    
                    接口封装和代码整理
            
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        <li class="chapter " data-level="3.1.11" data-path="../../lab-0/guide/summary.html">
            
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                    小结
            
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        <li class="chapter " data-level="3.2" >
            
                <span>
            
                    
                    实验指导一
            
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        <li class="chapter " data-level="3.2.1" data-path="../../lab-1/guide/intro.html">
            
                <a href="../../lab-1/guide/intro.html">
            
                    
                    摘要
            
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        <li class="chapter " data-level="3.2.2" data-path="../../lab-1/guide/part-1.html">
            
                <a href="../../lab-1/guide/part-1.html">
            
                    
                    什么是中断
            
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        <li class="chapter " data-level="3.2.3" data-path="../../lab-1/guide/part-2.html">
            
                <a href="../../lab-1/guide/part-2.html">
            
                    
                    RISC-V 中的中断
            
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        <li class="chapter " data-level="3.2.4" data-path="../../lab-1/guide/part-3.html">
            
                <a href="../../lab-1/guide/part-3.html">
            
                    
                    程序运行状态
            
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                    状态的保存与恢复
            
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        <li class="chapter " data-level="3.2.6" data-path="../../lab-1/guide/part-5.html">
            
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                    进入中断处理流程
            
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        <li class="chapter " data-level="3.2.7" data-path="../../lab-1/guide/part-6.html">
            
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                    时钟中断
            
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        <li class="chapter " data-level="3.2.8" data-path="../../lab-1/guide/summary.html">
            
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                    小结
            
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        <li class="chapter " data-level="3.3" >
            
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                    实验指导二
            
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        <li class="chapter " data-level="3.3.1" data-path="../../lab-2/guide/intro.html">
            
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                    摘要
            
                </a>
            

            
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        <li class="chapter " data-level="3.3.2" data-path="../../lab-2/guide/part-1.html">
            
                <a href="../../lab-2/guide/part-1.html">
            
                    
                    动态内存分配
            
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        <li class="chapter " data-level="3.3.3" data-path="../../lab-2/guide/part-2.html">
            
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                    物理内存探测
            
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        <li class="chapter " data-level="3.3.4" data-path="../../lab-2/guide/part-3.html">
            
                <a href="../../lab-2/guide/part-3.html">
            
                    
                    物理内存管理
            
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        <li class="chapter " data-level="3.3.5" data-path="../../lab-2/guide/summary.html">
            
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                    小结
            
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        <li class="chapter " data-level="3.4" >
            
                <span>
            
                    
                    实验指导三
            
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        <li class="chapter " data-level="3.4.1" data-path="intro.html">
            
                <a href="intro.html">
            
                    
                    摘要
            
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        </li>
    
        <li class="chapter " data-level="3.4.2" data-path="part-1.html">
            
                <a href="part-1.html">
            
                    
                    从虚拟地址到物理地址
            
                </a>
            

            
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        <li class="chapter " data-level="3.4.3" data-path="part-2.html">
            
                <a href="part-2.html">
            
                    
                    修改内核
            
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        <li class="chapter active" data-level="3.4.4" data-path="part-3.html">
            
                <a href="part-3.html">
            
                    
                    实现页表
            
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        <li class="chapter " data-level="3.4.5" data-path="part-4.html">
            
                <a href="part-4.html">
            
                    
                    实现内核重映射
            
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        <li class="chapter " data-level="3.4.6" data-path="part-5.html">
            
                <a href="part-5.html">
            
                    
                    页面置换*
            
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        </li>
    
        <li class="chapter " data-level="3.4.7" data-path="summary.html">
            
                <a href="summary.html">
            
                    
                    小结
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.5" >
            
                <span>
            
                    
                    实验指导四
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="3.5.1" data-path="../../lab-4/guide/intro.html">
            
                <a href="../../lab-4/guide/intro.html">
            
                    
                    摘要
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.5.2" data-path="../../lab-4/guide/part-1.html">
            
                <a href="../../lab-4/guide/part-1.html">
            
                    
                    线程和进程
            
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        <li class="chapter " data-level="3.5.3" data-path="../../lab-4/guide/part-2.html">
            
                <a href="../../lab-4/guide/part-2.html">
            
                    
                    线程的创建
            
                </a>
            

            
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        <li class="chapter " data-level="3.5.4" data-path="../../lab-4/guide/part-3.html">
            
                <a href="../../lab-4/guide/part-3.html">
            
                    
                    线程的切换
            
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        <li class="chapter " data-level="3.5.5" data-path="../../lab-4/guide/part-4.html">
            
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                    线程的结束
            
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        <li class="chapter " data-level="3.5.6" data-path="../../lab-4/guide/part-5.html">
            
                <a href="../../lab-4/guide/part-5.html">
            
                    
                    内核栈
            
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        <li class="chapter " data-level="3.5.7" data-path="../../lab-4/guide/part-6.html">
            
                <a href="../../lab-4/guide/part-6.html">
            
                    
                    线程调度
            
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        <li class="chapter " data-level="3.5.8" data-path="../../lab-4/guide/summary.html">
            
                <a href="../../lab-4/guide/summary.html">
            
                    
                    小结
            
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        <li class="chapter " data-level="3.6" >
            
                <span>
            
                    
                    实验指导五
            
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        <li class="chapter " data-level="3.6.1" data-path="../../lab-5/guide/intro.html">
            
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                    摘要
            
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        <li class="chapter " data-level="3.6.2" data-path="../../lab-5/guide/part-1.html">
            
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                    设备树
            
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        <li class="chapter " data-level="3.6.3" data-path="../../lab-5/guide/part-2.html">
            
                <a href="../../lab-5/guide/part-2.html">
            
                    
                    virtio
            
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        <li class="chapter " data-level="3.6.4" data-path="../../lab-5/guide/part-3.html">
            
                <a href="../../lab-5/guide/part-3.html">
            
                    
                    驱动和块设备驱动
            
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        <li class="chapter " data-level="3.6.5" data-path="../../lab-5/guide/part-4.html">
            
                <a href="../../lab-5/guide/part-4.html">
            
                    
                    文件系统
            
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        <li class="chapter " data-level="3.6.6" data-path="../../lab-5/guide/summary.html">
            
                <a href="../../lab-5/guide/summary.html">
            
                    
                    小结
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="3.7" >
            
                <span>
            
                    
                    实验指导六
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="3.7.1" data-path="../../lab-6/guide/intro.html">
            
                <a href="../../lab-6/guide/intro.html">
            
                    
                    摘要
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.7.2" data-path="../../lab-6/guide/part-1.html">
            
                <a href="../../lab-6/guide/part-1.html">
            
                    
                    构建用户程序框架
            
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        <li class="chapter " data-level="3.7.3" data-path="../../lab-6/guide/part-2.html">
            
                <a href="../../lab-6/guide/part-2.html">
            
                    
                    打包为磁盘镜像
            
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        <li class="chapter " data-level="3.7.4" data-path="../../lab-6/guide/part-3.html">
            
                <a href="../../lab-6/guide/part-3.html">
            
                    
                    解析 ELF 文件并创建线程
            
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        <li class="chapter " data-level="3.7.5" data-path="../../lab-6/guide/part-4.html">
            
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                    实现系统调用
            
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        <li class="chapter " data-level="3.7.6" data-path="../../lab-6/guide/part-5.html">
            
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                    处理文件描述符
            
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        <li class="chapter " data-level="3.7.7" data-path="../../lab-6/guide/part-6.html">
            
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                    条件变量
            
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        <li class="chapter " data-level="3.7.8" data-path="../../lab-6/guide/summary.html">
            
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                    小结
            
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        <li class="header">实验题</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../../lab-1/practice.html">
            
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                    实验一：中断
            
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        <li class="chapter " data-level="4.2" data-path="../../lab-2/practice.html">
            
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                    实验二：内存分配
            
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                    实验三：虚实地址转换
            
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                    实验四（上）：线程
            
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                    实验四（下）：线程调度
            
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        <li class="chapter " data-level="4.6" data-path="../../lab-6/practice.html">
            
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                    实验六：系统调用
            
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        <li class="header">开发笔记</li>
        
        
    
        <li class="chapter " data-level="5.1" data-path="../../format/partition.html">
            
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                    文档代码划分
            
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                    文档格式规范
            
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                    代码格式规范
            
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<p>&#x5BF9;&#x4E8E;&#x9875;&#x8868;&#x9879;&#x7684;&#x4F4D;&#x7EA7;&#x522B;&#x7684;&#x64CD;&#x4F5C;&#xFF0C;&#x9996;&#x5148;&#x9700;&#x8981;&#x52A0;&#x5165;&#x4E24;&#x4E2A;&#x5173;&#x4E8E;&#x4F4D;&#x64CD;&#x4F5C;&#x7684; crate&#xFF1A;</p>
<p></p><p class="code-label">os/Cargo.toml</p><p></p>
<pre><code class="lang-toml"><span class="hljs-attr">bitflags</span> = <span class="hljs-string">&quot;1.2.1&quot;</span>
<span class="hljs-attr">bit_field</span> = <span class="hljs-string">&quot;0.10.0&quot;</span>
</code></pre>
<p>&#x7136;&#x540E;&#xFF0C;&#x9996;&#x5148;&#x4E86;&#x6784;&#x5EFA;&#x4E86;&#x901A;&#x8FC7;&#x865A;&#x62DF;&#x9875;&#x53F7;&#x83B7;&#x5F97;&#x4E09;&#x7EA7; VPN &#x7684;&#x51FD;&#x6570;&#xFF1A;
</p><p class="code-label">os/src/memory/address.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-keyword">impl</span> VirtualPageNumber {
    <span class="hljs-comment">/// &#x5F97;&#x5230;&#x4E00;&#x3001;&#x4E8C;&#x3001;&#x4E09;&#x7EA7;&#x9875;&#x53F7;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">levels</span></span>(<span class="hljs-keyword">self</span>) -&gt; [usize; <span class="hljs-number">3</span>] {
        [
            <span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>.get_bits(<span class="hljs-number">18</span>..<span class="hljs-number">27</span>),
            <span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>.get_bits(<span class="hljs-number">9</span>..<span class="hljs-number">18</span>),
            <span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>.get_bits(<span class="hljs-number">0</span>..<span class="hljs-number">9</span>),
        ]
    }
}
</code></pre>
<h3 id="&#x9875;&#x8868;&#x9879;">&#x9875;&#x8868;&#x9879;</h3>
<p>&#x540E;&#x9762;&#xFF0C;&#x6211;&#x4EEC;&#x6765;&#x5B9E;&#x73B0;&#x9875;&#x8868;&#x9879;&#xFF0C;&#x5176;&#x5B9E;&#x5C31;&#x662F;&#x5BF9;&#x4E00;&#x4E2A; <code>usize</code>&#xFF08;8 &#x5B57;&#x8282;&#xFF09;&#x7684;&#x5C01;&#x88C5;&#xFF0C;&#x540C;&#x65F6;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x7528;&#x521A;&#x521A;&#x52A0;&#x5165;&#x7684; bit &#x7EA7;&#x522B;&#x64CD;&#x4F5C;&#x7684; crate &#x5BF9;&#x5176;&#x5B9E;&#x73B0;&#x4E00;&#x4E9B;&#x53D6;&#x51FA;&#x7279;&#x5B9A;&#x6BB5;&#x7684;&#x65B9;&#x4FBF;&#x540E;&#x7EED;&#x5B9E;&#x73B0;&#x7684;&#x51FD;&#x6570;&#xFF1A;</p>
<p></p><p class="code-label">os/src/memory/mapping/page_table_entry.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// Sv39 &#x7ED3;&#x6784;&#x7684;&#x9875;&#x8868;&#x9879;</span>
<span class="hljs-meta">#[derive(Copy, Clone, Default)]</span>
<span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">PageTableEntry</span></span>(usize);

<span class="hljs-comment">/// Sv39 &#x9875;&#x8868;&#x9879;&#x4E2D;&#x6807;&#x5FD7;&#x4F4D;&#x7684;&#x4F4D;&#x7F6E;</span>
<span class="hljs-keyword">const</span> FLAG_RANGE: core::ops::Range&lt;usize&gt; = <span class="hljs-number">0</span>..<span class="hljs-number">8</span>;
<span class="hljs-comment">/// Sv39 &#x9875;&#x8868;&#x9879;&#x4E2D;&#x7269;&#x7406;&#x9875;&#x53F7;&#x7684;&#x4F4D;&#x7F6E;</span>
<span class="hljs-keyword">const</span> PAGE_NUMBER_RANGE: core::ops::Range&lt;usize&gt; = <span class="hljs-number">10</span>..<span class="hljs-number">54</span>;

<span class="hljs-keyword">impl</span> PageTableEntry {
    <span class="hljs-comment">/// &#x5C06;&#x76F8;&#x5E94;&#x9875;&#x53F7;&#x548C;&#x6807;&#x5FD7;&#x5199;&#x5165;&#x4E00;&#x4E2A;&#x9875;&#x8868;&#x9879;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">new</span></span>(page_number: <span class="hljs-built_in">Option</span>&lt;PhysicalPageNumber&gt;, <span class="hljs-keyword">mut</span> flags: Flags) -&gt; <span class="hljs-keyword">Self</span> {
        <span class="hljs-comment">// &#x6807;&#x5FD7;&#x4F4D;&#x4E2D;&#x662F;&#x5426;&#x5305;&#x542B; Valid &#x53D6;&#x51B3;&#x4E8E; page_number &#x662F;&#x5426;&#x4E3A; Some</span>
        flags.set(Flags::VALID, page_number.is_some());
        <span class="hljs-keyword">Self</span>(
            *<span class="hljs-number">0usize</span>
                .set_bits(FLAG_RANGE, flags.bits() <span class="hljs-keyword">as</span> usize)
                .set_bits(PAGE_NUMBER_RANGE, page_number.unwrap_or_default().into()),
        )
    }
    <span class="hljs-comment">/// &#x8BBE;&#x7F6E;&#x7269;&#x7406;&#x9875;&#x53F7;&#xFF0C;&#x540C;&#x65F6;&#x6839;&#x636E; ppn &#x662F;&#x5426;&#x4E3A; Some &#x6765;&#x8BBE;&#x7F6E; Valid &#x4F4D;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">update_page_number</span></span>(&amp;<span class="hljs-keyword">mut</span> <span class="hljs-keyword">self</span>, ppn: <span class="hljs-built_in">Option</span>&lt;PhysicalPageNumber&gt;) {
        <span class="hljs-keyword">if</span> <span class="hljs-keyword">let</span> <span class="hljs-literal">Some</span>(ppn) = ppn {
            <span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>
                .set_bits(FLAG_RANGE, (<span class="hljs-keyword">self</span>.flags() | Flags::VALID).bits() <span class="hljs-keyword">as</span> usize)
                .set_bits(PAGE_NUMBER_RANGE, ppn.into());
        } <span class="hljs-keyword">else</span> {
            <span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>
                .set_bits(FLAG_RANGE, (<span class="hljs-keyword">self</span>.flags() - Flags::VALID).bits() <span class="hljs-keyword">as</span> usize)
                .set_bits(PAGE_NUMBER_RANGE, <span class="hljs-number">0</span>);
        }
    }
    <span class="hljs-comment">/// &#x83B7;&#x53D6;&#x9875;&#x53F7;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">page_number</span></span>(&amp;<span class="hljs-keyword">self</span>) -&gt; PhysicalPageNumber {
        PhysicalPageNumber::from(<span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>.get_bits(<span class="hljs-number">10</span>..<span class="hljs-number">54</span>))
    }
    <span class="hljs-comment">/// &#x83B7;&#x53D6;&#x5730;&#x5740;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">address</span></span>(&amp;<span class="hljs-keyword">self</span>) -&gt; PhysicalAddress {
        PhysicalAddress::from(<span class="hljs-keyword">self</span>.page_number())
    }
    <span class="hljs-comment">/// &#x83B7;&#x53D6;&#x6807;&#x5FD7;&#x4F4D;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">flags</span></span>(&amp;<span class="hljs-keyword">self</span>) -&gt; Flags {
        <span class="hljs-keyword">unsafe</span> { Flags::from_bits_unchecked(<span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>.get_bits(..<span class="hljs-number">8</span>) <span class="hljs-keyword">as</span> <span class="hljs-keyword">u8</span>) }
    }
    <span class="hljs-comment">/// &#x662F;&#x5426;&#x4E3A;&#x7A7A;&#xFF08;&#x53EF;&#x80FD;&#x975E;&#x7A7A;&#x4E5F;&#x975E; Valid&#xFF09;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">is_empty</span></span>(&amp;<span class="hljs-keyword">self</span>) -&gt; <span class="hljs-keyword">bool</span> {
        <span class="hljs-keyword">self</span>.<span class="hljs-number">0</span> == <span class="hljs-number">0</span>
    }
}

<span class="hljs-keyword">impl</span> core::fmt::Debug <span class="hljs-keyword">for</span> PageTableEntry {
    <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">fmt</span></span>(&amp;<span class="hljs-keyword">self</span>, formatter: &amp;<span class="hljs-keyword">mut</span> core::fmt::Formatter) -&gt; core::fmt::<span class="hljs-built_in">Result</span> {
        formatter
            .debug_struct(<span class="hljs-string">&quot;PageTableEntry&quot;</span>)
            .field(<span class="hljs-string">&quot;value&quot;</span>, &amp;<span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>)
            .field(<span class="hljs-string">&quot;page_number&quot;</span>, &amp;<span class="hljs-keyword">self</span>.page_number())
            .field(<span class="hljs-string">&quot;flags&quot;</span>, &amp;<span class="hljs-keyword">self</span>.flags())
            .finish()
    }
}

<span class="hljs-built_in">bitflags!</span> {
    <span class="hljs-comment">/// &#x9875;&#x8868;&#x9879;&#x4E2D;&#x7684; 8 &#x4E2A;&#x6807;&#x5FD7;&#x4F4D;</span>
    <span class="hljs-meta">#[derive(Default)]</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">Flags</span></span>: <span class="hljs-keyword">u8</span> {
        <span class="hljs-comment">/// &#x6709;&#x6548;&#x4F4D;</span>
        <span class="hljs-keyword">const</span> VALID =       <span class="hljs-number">1</span> &lt;&lt; <span class="hljs-number">0</span>;
        <span class="hljs-comment">/// &#x53EF;&#x8BFB;&#x4F4D;</span>
        <span class="hljs-keyword">const</span> READABLE =    <span class="hljs-number">1</span> &lt;&lt; <span class="hljs-number">1</span>;
        <span class="hljs-comment">/// &#x53EF;&#x5199;&#x4F4D;</span>
        <span class="hljs-keyword">const</span> WRITABLE =    <span class="hljs-number">1</span> &lt;&lt; <span class="hljs-number">2</span>;
        <span class="hljs-comment">/// &#x53EF;&#x6267;&#x884C;&#x4F4D;</span>
        <span class="hljs-keyword">const</span> EXECUTABLE =  <span class="hljs-number">1</span> &lt;&lt; <span class="hljs-number">3</span>;
        <span class="hljs-comment">/// &#x7528;&#x6237;&#x4F4D;</span>
        <span class="hljs-keyword">const</span> USER =        <span class="hljs-number">1</span> &lt;&lt; <span class="hljs-number">4</span>;
        <span class="hljs-comment">/// &#x5168;&#x5C40;&#x4F4D;&#xFF0C;&#x6211;&#x4EEC;&#x4E0D;&#x4F1A;&#x4F7F;&#x7528;</span>
        <span class="hljs-keyword">const</span> GLOBAL =      <span class="hljs-number">1</span> &lt;&lt; <span class="hljs-number">5</span>;
        <span class="hljs-comment">/// &#x5DF2;&#x4F7F;&#x7528;&#x4F4D;&#xFF0C;&#x7528;&#x4E8E;&#x66FF;&#x6362;&#x7B97;&#x6CD5;</span>
        <span class="hljs-keyword">const</span> ACCESSED =    <span class="hljs-number">1</span> &lt;&lt; <span class="hljs-number">6</span>;
        <span class="hljs-comment">/// &#x5DF2;&#x4FEE;&#x6539;&#x4F4D;&#xFF0C;&#x7528;&#x4E8E;&#x66FF;&#x6362;&#x7B97;&#x6CD5;</span>
        <span class="hljs-keyword">const</span> DIRTY =       <span class="hljs-number">1</span> &lt;&lt; <span class="hljs-number">7</span>;
    }
}
</code></pre>
<h3 id="&#x9875;&#x8868;">&#x9875;&#x8868;</h3>
<p>&#x6709;&#x4E86;&#x9875;&#x8868;&#x9879;&#xFF0C;512 &#x4E2A;&#x8FDE;&#x7EED;&#x7684;&#x9875;&#x8868;&#x9879;&#x7EC4;&#x6210;&#x7684; 4KB &#x7269;&#x7406;&#x9875;&#xFF0C;&#x540C;&#x65F6;&#x518D;&#x52A0;&#x4E0A;&#x4E00;&#x4E9B;&#x8BF8;&#x5982;&#x591A;&#x7EA7;&#x6DFB;&#x52A0;&#x6620;&#x5C04;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x5C01;&#x88C5;&#x4E3A;&#x9875;&#x8868;&#x3002;</p>
<p></p><p class="code-label">os/src/memory/mapping/page_table.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x5B58;&#x6709; 512 &#x4E2A;&#x9875;&#x8868;&#x9879;&#x7684;&#x9875;&#x8868;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// &#x6CE8;&#x610F;&#x6211;&#x4EEC;&#x4E0D;&#x4F1A;&#x4F7F;&#x7528;&#x5E38;&#x89C4;&#x7684; Rust &#x8BED;&#x6CD5;&#x6765;&#x521B;&#x5EFA; `PageTable`&#x3002;&#x76F8;&#x53CD;&#xFF0C;&#x6211;&#x4EEC;&#x4F1A;&#x5206;&#x914D;&#x4E00;&#x4E2A;&#x7269;&#x7406;&#x9875;&#xFF0C;</span>
<span class="hljs-comment">/// &#x5176;&#x5BF9;&#x5E94;&#x4E86;&#x4E00;&#x6BB5;&#x7269;&#x7406;&#x5185;&#x5B58;&#xFF0C;&#x7136;&#x540E;&#x76F4;&#x63A5;&#x628A;&#x5176;&#x5F53;&#x505A;&#x9875;&#x8868;&#x8FDB;&#x884C;&#x8BFB;&#x5199;&#x3002;&#x6211;&#x4EEC;&#x4F1A;&#x5728;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x4E2D;&#x7528;&#x4E00;&#x4E2A;&#x300C;&#x6307;&#x9488;&#x300D;</span>
<span class="hljs-comment">/// [`PageTableTracker`] &#x6765;&#x8BB0;&#x5F55;&#x8FD9;&#x4E2A;&#x9875;&#x8868;&#x3002;</span>
<span class="hljs-meta">#[repr(C)]</span>
<span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">PageTable</span></span> {
    <span class="hljs-keyword">pub</span> entries: [PageTableEntry; PAGE_SIZE / <span class="hljs-number">8</span>],
}

<span class="hljs-keyword">impl</span> PageTable {
    <span class="hljs-comment">/// &#x5C06;&#x9875;&#x8868;&#x6E05;&#x96F6;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">zero_init</span></span>(&amp;<span class="hljs-keyword">mut</span> <span class="hljs-keyword">self</span>) {
        <span class="hljs-keyword">self</span>.entries = [<span class="hljs-built_in">Default</span>::default(); PAGE_SIZE / <span class="hljs-number">8</span>];
    }
}
</code></pre>
<p>&#x7136;&#x800C;&#xFF0C;&#x6211;&#x4EEC;&#x4E0D;&#x4F1A;&#x628A;&#x8FD9;&#x4E2A;&#x5DE8;&#x5927;&#x7684;&#x6570;&#x7EC4;&#x5728;&#x51FD;&#x6570;&#x4E4B;&#x95F4;&#x4E0D;&#x505C;&#x4F20;&#x9012;&#xFF0C;&#x6211;&#x4EEC;&#x8FD9;&#x91CC;&#x7684;&#x601D;&#x8DEF;&#x4E5F;&#x540C;&#x6837;&#x66F4;&#x591A;&#x5229;&#x7528; Rust &#x7684;&#x7279;&#x6027;&#xFF0C;&#x6240;&#x4EE5;&#x505A;&#x6CD5;&#x662F;&#x5229;&#x7528;&#x4E00;&#x4E2A; <code>PageTableTracker</code> &#x7684;&#x7ED3;&#x6784;&#x5BF9; <code>FrameTracker</code> &#x5C01;&#x88C5;&#xFF0C;&#x4F46;&#x662F;&#x91CC;&#x9762;&#x7684;&#x884C;&#x4E3A;&#x662F;&#x5BF9; <code>FrameTracker</code> &#x8BB0;&#x5F55;&#x7684;&#x7269;&#x7406;&#x9875;&#x5F53;&#x6210; <code>PageTable</code> &#x8FDB;&#x884C;&#x64CD;&#x4F5C;&#x3002;&#x540C;&#x65F6;&#xFF0C;&#x8FD9;&#x4E2A; <code>PageTableTracker</code> &#x548C; <code>PageTableEntry</code> &#x4E5F;&#x901A;&#x8FC7;&#x4E00;&#x4E9B; Rust &#x4E2D;&#x7684;&#x81EA;&#x52A8;&#x89E3;&#x5F15;&#x7528;&#x7684;&#x7279;&#x6027;&#x4E3A;&#x540E;&#x9762;&#x7684;&#x5B9E;&#x73B0;&#x94FA;&#x5E73;&#x4E86;&#x9053;&#x8DEF;&#xFF0C;&#x6BD4;&#x5982;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x628A; <code>PageTableTracker</code> &#x5F53;&#x6210; <code>PageTable</code> &#x5BF9;&#x5F85;&#xFF0C;&#x540C;&#x65F6;&#xFF0C;&#x5982;&#x679C;&#x4E00;&#x4E2A; <code>PageTableEntry</code> &#x6307;&#x5411;&#x7684;&#x662F;&#x53E6;&#x4E00;&#x4E2A; <code>PageTable</code> &#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x65B9;&#x4FBF;&#x7684;&#x8BA9;&#x7F16;&#x8BD1;&#x5668;&#x81EA;&#x52A8;&#x5B8C;&#x6210;&#x8FD9;&#x4E9B;&#x5DE5;&#x4F5C;&#x3002;</p>
<p></p><p class="code-label">os/src/memory/mapping/page_table.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">/// &#x7C7B;&#x4F3C;&#x4E8E; [`FrameTracker`]&#xFF0C;&#x7528;&#x4E8E;&#x8BB0;&#x5F55;&#x67D0;&#x4E00;&#x4E2A;&#x5185;&#x5B58;&#x4E2D;&#x9875;&#x8868;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// &#x6CE8;&#x610F;&#x5230;&#xFF0C;&#x300C;&#x771F;&#x6B63;&#x7684;&#x9875;&#x8868;&#x300D;&#x4F1A;&#x653E;&#x5728;&#x6211;&#x4EEC;&#x5206;&#x914D;&#x51FA;&#x6765;&#x7684;&#x7269;&#x7406;&#x9875;&#x5F53;&#x4E2D;&#xFF0C;&#x800C;&#x4E0D;&#x5E94;&#x653E;&#x5728;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x7684;&#x8FD0;&#x884C;&#x6808;&#x6216;&#x5806;&#x4E2D;&#x3002;</span>
<span class="hljs-comment">/// &#x800C; `PageTableTracker` &#x4F1A;&#x4FDD;&#x5B58;&#x5728;&#x67D0;&#x4E2A;&#x7EBF;&#x7A0B;&#x7684;&#x5143;&#x6570;&#x636E;&#x4E2D;&#xFF08;&#x4E5F;&#x5C31;&#x662F;&#x5728;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x7684;&#x5806;&#x4E0A;&#xFF09;&#xFF0C;&#x6307;&#x5411;&#x5176;&#x771F;&#x6B63;&#x7684;&#x9875;&#x8868;&#x3002;</span>
<span class="hljs-comment">///</span>
<span class="hljs-comment">/// &#x5F53; `PageTableTracker` &#x88AB; drop &#x65F6;&#xFF0C;&#x4F1A;&#x81EA;&#x52A8; drop `FrameTracker`&#xFF0C;&#x8FDB;&#x800C;&#x91CA;&#x653E;&#x5E27;&#x3002;</span>
<span class="hljs-keyword">pub</span> <span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">PageTableTracker</span></span>(<span class="hljs-keyword">pub</span> FrameTracker);

<span class="hljs-keyword">impl</span> PageTableTracker {
    <span class="hljs-comment">/// &#x5C06;&#x4E00;&#x4E2A;&#x5206;&#x914D;&#x7684;&#x5E27;&#x6E05;&#x96F6;&#xFF0C;&#x5F62;&#x6210;&#x7A7A;&#x7684;&#x9875;&#x8868;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">new</span></span>(frame: FrameTracker) -&gt; <span class="hljs-keyword">Self</span> {
        <span class="hljs-keyword">let</span> <span class="hljs-keyword">mut</span> page_table = <span class="hljs-keyword">Self</span>(frame);
        page_table.zero_init();
        page_table
    }
    <span class="hljs-comment">/// &#x83B7;&#x53D6;&#x7269;&#x7406;&#x9875;&#x53F7;</span>
    <span class="hljs-keyword">pub</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">page_number</span></span>(&amp;<span class="hljs-keyword">self</span>) -&gt; PhysicalPageNumber {
        <span class="hljs-keyword">self</span>.<span class="hljs-number">0</span>.page_number()
    }
}
</code></pre>
<p>&#x81F3;&#x6B64;&#xFF0C;&#x6211;&#x4EEC;&#x5B8C;&#x6210;&#x4E86;&#x7269;&#x7406;&#x9875;&#x4E2D;&#x7684;&#x9875;&#x8868;&#x3002;&#x540E;&#x9762;&#xFF0C;&#x6211;&#x4EEC;&#x5C06;&#x628A;&#x5185;&#x6838;&#x4E2D;&#x5404;&#x4E2A;&#x6BB5;&#x505A;&#x4E00;&#x4E2A;&#x66F4;&#x7CBE;&#x7EC6;&#x7684;&#x6620;&#x5C04;&#xFF0C;&#x628A;&#x4E4B;&#x524D;&#x7684;&#x90A3;&#x4E2A;&#x7C97;&#x7CD9;&#x7684;&#x521D;&#x59CB;&#x6620;&#x5C04;&#x9875;&#x8868;&#x66FF;&#x6362;&#x6389;&#x3002;
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